<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>布局视口</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="viewport" content="width=device-width, initial-scale=1.0,maximum-scale=1,minimum-scale=1,user-scalable=no">
  <style>
    div{
      width: 100px;
      height: 100px;
      background-color: aqua;
    }
  </style>
</head>
<body>
  <div></div>
</body>
</html>